I don't have the stock OS anymore, so I can't confirm it works with B&N's browser, but in most Android browsers you long-press an image to bring up the "save image" option, which will probably save it in your Downloads folder. Same for text: long-press a word to highlight it, and there will be arrow-tabstop-thingies at either end of the highlighting to drag over the rest of what you want highlighted, then when you tap the highlighted text again, it will be copied to clipboard. I'm not sure if there's any kind of text editor that comes with the stock OS where you can paste it, but you could always drop it in an email to yourself.